What is my alternator output????

[jvcoconut]

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Hi,
I have a 2005 232 Sunesta with the 5.0 GXI duoprop. Does anyone know what the alternator amp output rating is on this?

The reason I ask is that I currently have a dual battery system with the factory battery switch. I will be running two amps for my boat system and two amps for my waketower speaker system. I wanted to add a 3rd battery with an isolator.

The majority of the time only two amps will be playing when on the beach and/or boating around, with the other two amps (4 total) playing while wakeboarding.

The wiring portion is doable, but adding the isolator and 3rd battery, I don't think I would have to upgrade to a 3 position battery switch right? My plans are to have two batteries dedicated to the system and one for cranking....but obviously charge them all together.....................DOABLE or NOT??????? Do I need to upgrade Alternator size?

 

[rodbolt]

Re: What is my alternator output????

usually its about 65 amps on an EFI motor.
myself I would use a single input 3 output isolator rated at 80 amps or so.
its quick easy and simple.
it will also prevent one battery draining into the other.
what is the combined current draw of the 4 amps ?
the engine needs about 9 to run.